S19A0116abst
S19A0116
The Hyper Suprime-Cam (HSC) Survey is an on-going 300-night project of the Subaru Telescope. All of its wide, deep, and ultradeep layers are observed in grizy broad-band filters; there are also narrow-band observations in the deep and ultradeep layers. A large cluster sample at z>1 with a well-defined selection function would be a lasting legacy from the HSC survey. Here we initiate an observational campaign for the cluster mass calibration via velocity dispersion, a critical first step towards building up the selection function. We have used the red sequence cluster finder CAMIRA to select a sample of 6 rich clusters at z=1−1.2. Here we propose GMOS multi-object spectroscopy follow up of these clusters, aiming for 20 member galaxies per cluster. With our sample we could achieve a 25% accuracy in the normalization of the richness–cluster mass relation, a feat that is yet quite challenging for ground-based weak gravitational lensing. Such a measurement will enable us to examine various aspects of galaxy–halo connection that require good estimates of cluster mass, such as the buildup of cluster galaxy population and brightest cluster galaxies. As two of our targets are likely in a merging state, we are uniquely poised to study effects of cluster dynamical states on the galaxy–halo connection at z>1.
This document was translated from LATEX by HEVEA.